Winter defended Kim in May after Chloe Grace Moretz criticized the mom-of-two's nude selfie.
"Many have asked about my opinion on a certain interview.... all I'm going to say is this: If you take a photo in which you feel confident about yourself and think it spreads a positive image, then go for it," she wrote on Instagram.
"The 'background' doesn't matter - what maters is the message you are putting out there is true to what you believe in - not what anyone else says about you," the star asserted. "No need to put one another down."
Winter herself has faced plenty of backlash for her revealing social media posts. She admitted in the fall issue of Rogue that criticism "no longer hits her as hard" as it did in her early career.
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"At this stage, you get sort of jaded after a certain period of time," the actress told the magazine. "I feel like I've been in the industry for so long that I have gotten to the point where people's comments and the exposure doesn't bother me as much."
Winter plays Alex Dunphy on the ABC sitcom "Modern Family," which airs Wednesdays at 9 p.m. ET.
She and "Aftermath" actor Levi Meaden enjoyed a tropical getaway to Cabo San Lucas, Mexico, over the weekend.
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